axorlov
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Posts posted by axorlov
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TK-880H supposed to produce 40W, not 45. All three of 880Hs I own show 30W on the power meter I trust (Diamond SX600) into the 200W dummy load.
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Thanks for your question... I'm in the process getting Ham Ticket, test May 29. So one of my desires is able to scan the channels I want without reconfig the radio. So question to the Ham guys, do you do both services (Ham-GMRS) in one handheld or not.
Jack
I don't. When I'm alone it's FT-1XD, when with family it's TK-3170. But there are dual band Part 90 HTs, for example Alinco DJ-MD5.
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Part 90/95 radios built in USA in the last 20 years? I'm not aware of any. If Ham gear is in question, Elecraft comes to mind.
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There are good news too: the radio is small enough to nicely fit into normal-sized garbage bin with space left for other rubbish one might have laying around in the house.
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Is that the really old style phonetic alphabet? I always get a kick out of some old timer pilot using that, getting corrected with the ICAO version, then saying "Affirmative!" then reading it back again the other way. I hope I'm gonna be old and snarky just like that
Aren't ICAO and NATO the same? Unless we argue semantics of ZOO-LUU vs ZOO-LOO? And that makes to me, who's English is not native, exactly ZI-RO sense.
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I was just looking through Part 95 looking for such a GMRS exclusion. I found only two references to store and forward (e.g. Simplex Repeater). Both were prohibitions in non-GMRS services. FRS and MURs. One is 95.2733. The other is 95.987.d.
Since repeaters are allowed in GMRS, and since there is no express exclusion of S&F devices in 95e, I conclude they are legal for use, but only when using the 462 main channel frequencies.
BTW, I too own the Argent Data SR1. Nice little box. Actually bought it to facility one-man simplex radio testing. It is programmed to give my callsign both in CW and in Voice.
Michael
WRHS965
KE8PLM
We actually discussed this here on this forum exactly a year ago, and I promised to find the wording. I still owe this to the community. One day (or night) when all booze is gone I'll do it. What I remember, is a specific prohibition or repeaters (with the word "repeater" explicitly used) for FRS, CB and MURS. But I also remember about store-and-forward not allowed either for 95E or for all of 95.
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Store and forward systems are prohibited. Simplex repeater could be interpreted as store-foward.
With that said, I admit to using Argent Data simplex repeater for the stated purpose. It's too damn useful in the woods.
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With a human dispatcher, yes, certainly. With a simplex repeater (seems to be not allowed by Part 95 rules), yes. To make a regular repeater one would need two radios, diplexer, repeater controller, etc..
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I'm reading the same lines, and my interpretation is there is a single $35 fee. We will see soon. At any rate, $7/year vs $3.5/year is not a big difference. Cost of good quality radios dwarfs this cost.
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The NATO phonetic alphabet use is not required and not expected. Just spell out callsign in English.
- SteveC7010 and Sean WRMH985
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Congrats! I'm not sure about 880 V1, but V2 tunes into the repeater part of Ham band without problem (only warning pop-up in the software). In the place where I live, San Francisco Bay Area, 70cm repeaters are quiet, except the ones that are placed lower in the mountains and linked to 2m repeaters. There is a reason for that, the PAVE PAWS missile defense site site north of Sacramento, that forced prominent high-placed 70cm repeaters to go off-air. On opposite, Los Angeles area has a huge number of 70cm repeaters on air. Quietness of the ether may not be an indication that there is something wrong with the radio.
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Pretty much any radio other than Btech-Baofeng would do that. All Part 95/Part 90 commercial radios certainly can be programmed that way. Not sure about Wouxun 805G, but owners would chime in and clarify that.
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At the base of the antenna, meaning close to the connector on the antenna? If at the base of the mast, then the choke will not prevent coupling with the mast.
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I forgot to mention I used the same snap on ferrite bead choke baluns (sp?) that were recommended for the original copper J-pole on the current Ed Fong. But on that note, I have the cable run inside the mast pole. Maybe not a good idea?
So, cannot pull antenna off from the mast to check the coupling? Too bad. Is there is a chance that the loop on the cable to pull it through the mast is too tight? The ferrite choke should be something like in the following link, installed as close as possible to antenna.
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Most likely you have your coax coupling with aluminum mast. J-poles create significant common-mode current on the outside of the coax. If mast is not metal, you may be able to get away with that. To verify, pull the coax away from the mast and check SWR again. If you see it changed, then this is it: coax coupling with the mast. To rectify add RF choke made of ferrites for UHF frequencies, or change antenna.
Off tangent: this forum has strange fascination with Ed Fong's antenna. It's cheap, sure. But it's a kit, that is missing important and expensive part: RF choke. There are better options for the GMRS antenna. The Browning BR-6140 was available for below $40 for long time, but sadly not anymore. It now commands the whopping $50 at AntennaFarm. If you are also into Ham, the dual-band Diamond X50 has acceptable SWR on GMRS, at around 1.7.
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After giving it some thought, it may be a valid experiment. HT (or FT-817) is inside the zip log, wrapped with kitchen foil, on the wet sand or swamp ground. Make sure there is absolutely no electrical connection between radio, or cable shield and the foil. MASSIVE choke on the coax, inside the same Faraday cage. Operator 1 is next to the radio pressing PTT through the foil, Operator 2 is measuring field strengths with whatever method available.
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Does it when you switch it to the back 259 port? I figured it did on the front BNC because that is designed for the rubber duck in the box.
Of course, the back connector and the front BNC connector are bolted to the same aluminum body of the FT-817/818. The ground bus inside the radio electrically bonded with body and case in several places.
I can only come up with the one sure way to isolate the body of HT or any other radio: put in Faraday cage NOT electrically connected to the body, but providing very low impedance and very short path to the ground. Something along "wrap your HT with kitchen foil, put inside the zip log and bury in the wet sand on the ocean beach". Also, have a very high-impedance RF choke on the coaxial. But how are you going to press PTT and speak/listen? The remote mic cable will radiate better than HT body, it's longer! (look up so called Tiger Tail) And I will repeat, this is the property of the short wavelength. The shorter, the easier for RF to escape through ground buses, connectors, cables, etc. The only solution is to wrap yourself together with your HT and have yourself buried with the radio in the wet sand. You would need a snorkeling pipe. Make sure your will is current and signed by two witnesses. And report the results! I'm genuinely interested.
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The FT-817 has exactly the same behavior as HT on VHF and UHF - meaning body being a part of the radiator. It's not a radio problem/feature, it is rather the attribute of the wavelength. On HF the diminutive body of 817 does not contribute anything meaningful to the electromagnetic field, but on UHF the linear dimensions make it very close to 1/4 wavelength, thus it will radiate, and a lot.
However, the original post was about low-power transmission, not about how to judge the radiation from the dummy load.
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Tough stuff! My past summer troubles on the outskirts of SF Bay Area during the fires, 5 days without the power, is a children camping expedition in the backyard, comparing to your story.
Anyway, after reading it, if it was me, I'd focus on better car-to-car-to-home-to-pedestrian system. GMRS gives you an option to run 50W with your family covered by one license. With antennas on the roofs of the vans/SUVs/cars, that's a lot of distance even in flat Florida. If I understand correctly, when hurricane is at full force, the crummy Ham antennas go down much sooner than commercial LMR installations. I would not put much hope into Ham during disaster. And certainly not into the Ham repeaters. I'm aware of ARES, and I saw (listened) to them few times, and my take out of it - they are not here to help the Precious Me, specifically. I'd forget them altogether and focus on what I can control: the reliable comm family system with trained participants.
Actually, this is exactly what I did some years ago - we have 40W mobiles in our cars and at home, everybody is trained to use mobiles and HTs (because we use them all the time when outdoors camping, hiking, etc), everybody is aware about Radio-3-3-3 protocol, the quick reference cards are in every car, the buttons and channels are programmed in the same way on mobiles and HTs. And there is a dedicated "home channel" programmed to the same "B" button on mobiles and HTs: the frequency+DPL, and there is also a reserve frequency. And there is a contingency plan. We live in Livermore, and both me and my wife commute to Silicon Valley proper, across the mountain ridge. So, should "the Big One" hit, everybody knows that it would take me 48 hrs MAX to get home on foot. If neither me, nor mom at home after that, the youngsters are on their own.
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The answer will depends on what do you want to do with Ham HT. If to talk on repeaters any HT will be good, and if to talk only on UHF repeaters, many of Part 95A radios will tune to 70cm band. If you are into camping-hunting-kayaking and want to talk to your Ham buddies, this is where VX-6R shines being waterproof and sturdy. Any digital activity in your area, DMR or D-Star or Yaesu's System Fusion? If you are interested in any, that narrows down the choice. The Cadillac of Ham HT's (when money no object) Kenwood TH-D74 is discontinued, thanks to fire on the component factory and pandemic. But they will come up with something along the lines of D74 real quick.
I have Yaesu FT-1XD, the predecessor of -3DR. Very complicated in operation comparing to foolproof Kenwood TK3170. But smaller and lighter. I've got it because I wanted APRS, this is the feature I use. Looking back and choosing between FT-1XD(-2DR, -3DR) and Kenwood TH-D72(-D74) I would still chose Yaesu because of its smaller and sturdier built and water resistance. On the other hand, Kenwood has packet modem, and can be used for Winlink, while with Yaesu is not that simple at all. And these Yaesu menus are killing me, even though I seem to remember them now without needing the cheat sheet. Choises, choices....
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Regarding TK-880, you want "-1" if you want to have Part 95A certification. This radio also tunes to 70cm band. You may also look at TK-8180, they seem to be more available on ebay lately. When I was building out my system years ago, ebay was literally flooded with TK-880 in every possible flavor. Today other choices seem to be more available.
The TK-3170 and 3173 may be a radio of choice, depending on who's choosing and why. I have both. They are quite big by modern standards. Lscott covered them already. Radio can work with both Li-Ion and Ni-MH batteries, that are available for a reasonable prices on ebay. Charger that can handle both chemistries is KSC-25.
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So, what is the difference between the TK-880-1 and the -2? I'm looking to use these for GMRS as a mobile and base station.
JG
The -1 -2 and -3 mean alignment in the UHF band. 1: 450-490MHz, 2: 485-512MHz, 3: 400-430MHz. Type -1 is 95A certified. The version V2 and no version, that is often called V1, are the versions of the hardware. For GMRS purposes they are no different.
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Completed the 50' Rhon45 tower install yesterday, mounted a tram 1450 uhf antenna on the top and fed it with 1/2" EDC4-50 hardline. I used a Comet mkII caa analyzer at the end going into the vxr7000 and it shows 49 ohm and 1.1 swr output is 50watts.
So everything seems near perfect, I am on a high point but I can only get into the repeater from about 1/4 mile away. The only thing I think can be an issue is the Tram 1450 antenna, it is just a wonderful dummyload. I ordered a DB408-b and a 22' chrome molly mast as a replacement. I was hoping to get at least 2 miles out of this current system. Anyone have any suggestions?
Make a plan for troubleshooting. It seems that you suspect an antenna, for whatever reason. So, confirm or refute this hypothesis, that the antenna is the trouble. Send a buddy in the car 15 miles away and communicate with him through this antenna and feedline on simplex, bypassing all the wonderful machinery, diplexers and stuff. Make sure you trust the antenna and the feeder. With the result on hand, the next troubleshooting step will become apparent.
TK-880H mount screw size and thread pitch
in Technical Discussion
Posted
Yep, M4x8 means 4mm metric thread, 8mm max length
You can find metric M4 in Lowes and such, but for wing-nuts and more interesting approaches Amazon may be better.